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Supplier Data - Polyetheretherketone ( PEEK ) ( Goodfellow )

Background

Polyethetetherketone ( PEEK ) is a high performance thermoplastic with the characteristics common to this group - strong, stiff, hard, high temperature resistance, good chemical resistance and inherently low flammability and smoke emission.

Polyethetetherketone ( PEEK ) is pale amber in colour and usually semi-crystalline and opaque, except thin films are usually amorphous and transparent. Polyethetetherketone ( PEEK ) also has very good resistance to wear, dynamic fatigue and radiation, but it is difficult to process and very expensive. Filled grades, including ones designed for bearing-type applications, are also used.

Applications of Polyethetetherketone ( PEEK ) include flexible printed circuit boards (film), fibres and monofilaments, injection moulded engineering components and items used in aerospace and radiation environments.

Key Properties

The key properties of Polyetheretherketone ( PEEK ) are tabulated below.

Table 1. Key properties

Chemical Resistance
Acids - concentrated Fair
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Good
Greases and Oils Good
Halogens Good
Ketones Good
Electrical Properties
Dielectric constant @ 1 MHz 3.2-3.3 @ 50 Hz - 10 Khz
Dielectric strength ( kv.mm-1 ) 19 @ 50 µm
Dissipation factor @ 1 MHz 0.003
Volume resistivity ( ohmcm ) 1015 - 1016
Mechanical Properties
Coefficient of friction 0.18
Elongation at break ( % ) 50
Hardness - Rockwell M99
Izod impact strength ( J.m-1 ) 85
Poisson’s ratio 0.4
Tensile modulus ( GPa ) 3.7 - 4.0
Tensile strength ( MPa ) 70-100
Physical Properties
Density ( g.cm-3 ) 1.26 - 1.32
Flammability V-0 @ 1.5 mm
Limiting oxygen index ( % ) 35
Radiation resistance - Alpha Good
Resistance to Ultra-violet Fair
Water absorption - equilibrium ( % ) 0.5
Water absorption - over 24 hours ( % ) 0.1-0.3
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 47/108
Heat-deflection temperature - 0.45 MPa ( °C ) >260
Heat-deflection temperature - 1.8 MPa (°C ) 160
Specific heat ( kJ.kg-1.K-1 ) 0.32
Thermal conductivity @ 23 °C ( W.m-1.K-1 ) 0.25
Upper working temperature (°C ) 250
Properties Polyetheretherketone Film
Property Value
Density g.cm-3 1.26 - amorphous
Dielectric Constant @ 1 MHz 3.3
Dielectric Strength @ 25 µm thick KV.mm-1 110-150
Dissipation Factor @ 1 MHz 0.005
Extension to break - Longitudinal % 240
Extension to break - Transverse % 240
Flammability VTM-1 @ 0.1 mm
Resistencia Corona @ 20 kV mm-1 50 Hz g.µm-1 35-50
Permeability to Oxygen @ 25 C x10-13.cm3.cm.cm-2.s-1.Pa-1 0.06-0.1
Permeability to Water @ 25 C x10-13.cm3.cm.cm-2.s-1.Pa-1 160-300
Shrinkage % 0.5 @ 150 C
Specific Heat kJ.kg-1.K-1 1.45
Tensile modulus - Longitudinal GPa 2.6
Tensile modulus - Transverse GPa 2.6
Tensile strength - Longitudinal MPa 120
Tensile strength - Transverse MPa 120
Properties Polyetheretherketone Fibre
Property Value
Specific Tenacity cN/tex 61
Density g.cm-3 1.30
Extension to break % 19
Knot Tenacity cN/Tex 36
Loop Tenacity cN/Tex 40
Modulus - 10% GPa 4.2
Modulus - 2% cN/Tex 500
Modulus - 2% GPa 6.5
Modulus - 5% GPa 4.35
Shrinkage @ 180 C % 1.1
Tensile Strength MPa 790
Properties Polyetheretherketone Monofilament
Property Value
Material Type A Type B Type C
Density g.cm-3 1.30 1.30 1.30
Extension to break % 38 35 20
Knot Tenacity cN/Tex 28 23 34
Loop Tenacity cN/Tex 25 19 17
Modulus - 10% GPa 1.85 2.8 3.4
Modulus - 2% cN/Tex 382 438 474
Modulus - 2% GPa 5.0 5.7 6.2
Modulus - 5% GPa 2.7 3.7 3.9
Shrinkage @ 180 C % 1.8 8.4 3.0
Tenacity cN/Tex 34 30 60
Tensile Strength GPa 0.44 0.39 0.78

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